Tokamachi City in Niigata Prefecture is located 205 kilometers west of Fukushima I Nuclear Power Plant. It's not even under the plume according to Professor Hayakawa's map.
Tokamachi is the green arrow. Fukushima I Nuke Plant is the red tag "D". (Map created at Jukurabe.)
From Yomiuri Shinbun (1:37PM JST 8/22/2011):
Tokamachi City in Niigata Prefecture announced on August 22 the result of the survey of radioactive materials in the soil in nursery schools and kindergartens in the city. 18,900 becquerels/kg of radioactive cesium was found in the sludge at the bottom of the container that collects rainwater at a public nursery school, and 27,000 becquerels/kg of radioactive cesium was found in the yard compost pile at a private kindergarten.
If the level of radioactive cesium exceeds 8,000 becquerels/kg up to 100,000 becquerels/kg, it has to be temporarily stored at a controlled processing plant. The city will consult the prefectural government as to how to dispose the sludge and the yard compost.
The samples were taken on August 12, and tested at a testing laboratory in Niigata. At both locations, the air radiation levels at 1 meter above the ground was 0.10 microsievert/hour and 0.14 microsieverts/hour, both of which were within the normal range.